A 34-yeаr-оld client with а T4 spinаl cоrd injury sustained 8 mоnths ago is receiving care on a medical unit after being admitted for a urinary tract infection. The client performs clean intermittent self-catheterization every 6 hours at home but has not catheterized in 8 hours due to nausea and fatigue. The client calls the nurse using the call light and reports: "I have a pounding headache, I can't see right, and my chest feels tight." Assessment findings: BP: 204/112 mm Hg (baseline 108/68) HR: 52 bpm, regular RR: 20 SpO₂: 96% on room air Skin above the level of injury: flushed, warm, and diaphoretic Skin below the level of injury: pale, cool, with piloerection ("goosebumps") Client reports blurred vision and nasal congestion Indwelling Foley is not in place; abdomen is palpably distended over the bladder Last bowel movement: 3 days ago What is the nurse's priority action?